Niacinamide or centella asiatica: which one to choose?

One corrects slowly, the other soothes quickly. Niacinamide acts on the skin barrier, shine, and complexion, with effects that take weeks to appear. Centella asiatica soothes reddened skin, with a faster and more focused result.

Two opposing logics

What niacinamide does

It strengthens the skin barrier, which limits water loss and makes the skin less reactive. It also acts on sebum production, which helps limit shine, and on complexion homogeneity.

It is one of the most well-documented active ingredients in common cosmetics — a point that clearly distinguishes it from most plant extracts.

Two to five percent is sufficient. Its slowness is its main drawback: six to eight weeks before judging results.

What centella asiatica is

A plant long used in traditional Asian medicine, whose extract has gained popularity in Korean then European cosmetics. It is often found under the name cica.

Its compounds — asiaticoside, madecassoside, asiatic acid — are used for their soothing action. In practice, centella asiatica is used on skin that reddens easily.

It does not act on shine, complexion, or sebum production. Its scope is narrow, but it is effective within it.

It is a creeping plant from Southeast Asia, long used in traditional medicine and also known as tiger grass. Its active compounds are saponins and triterpenic acids, whose proportions vary depending on the origin and extraction process.

For sensitive skin, what is reported relates to comfort: less irritation, a feeling of warmth that subsides more quickly. It is an active ingredient for tolerance rather than performance, and that is precisely what makes it useful.

Choose according to your needs

Skin that reddens, reacts to products: centella asiatica, which is its domain.

Skin that is shiny, with prominent pores, uneven complexion: niacinamide, the only one of the two for these issues.

Both at once: a common case, and the combination works well.

If you had to keep only one: niacinamide, whose scope of action is wider and better established.

Two different starting points. Niacinamide targets a mechanism – the appearance of pores, the evenness of the complexion, water retention. Centella targets a state: bringing reactive skin back to normal functioning.

Hence a simple rule for choosing. If the skin is healthy and you want to improve it, choose the first. If it reacts and you want to stabilize it, choose the second. Combining them in a skincare routine is possible and risk-free, but it does not replace this initial diagnosis.

A hyaluronic acid applied before either remains useful in both cases: it provides the hydration that neither the first nor the second provides, and its addition does not complicate anything.

Layering

Both are water-soluble and are applied early. The order between them matters little; many Korean formulas combine them in the same serum.

Apply to damp skin, wait one minute, then seal with a cream. This last step is essential: neither provides lipids.

The order does not matter as long as both are in the aqueous phase: neither provides fatty substances, and neither blocks the penetration of the other. Apply them one after the other, with a one-minute interval, then seal with the final texture.

For an already extensive routine, it is better to replace than to add. Sensitive skin does not tolerate accumulation well, and the benefit of a third active ingredient is almost always less than the risk it introduces.

For complexion radiance, regularity is key, not the number of products. A texture adapted to the skin type, applied twice a day, does more than three serums used intermittently.

Order of introduction on reactive skin

Start with centella asiatica alone for two weeks. It soothes and practically never causes problems.

Then introduce niacinamide, every other evening for the first week. A slight initial warming sensation is possible, and this progression allows distinguishing it from a genuine intolerance.

For reactive skin, start with the soothing one and add the other three weeks later. For stable skin, the reverse order also works well – it's the initial state that dictates, not a hierarchy between the two.

The chosen texture is as important as the active ingredient. A light serum for oily skin, an emulsion for dry skin: the same ingredient in two different bases gives two unrelated experiences, and this often explains contradictory opinions on the same product.

On available documentation

This is a difference worth noting. Niacinamide is the subject of numerous and converging studies; centella asiatica relies on more limited documentation, especially in cosmetic use.

This does not disqualify it — its soothing effect is observed with use. But the promises attached to it often exceed what is established.

How to recognize a good formula

For niacinamide: its position in the ingredient list and a concentration of two to five percent. Formulas with ten percent are not more effective and are more irritating.

For centella asiatica: the extract at the beginning of the list, a short formula, fragrance-free if your skin reacts. Ranges that display the word cica cover very unequal qualities.

Three benchmarks are sufficient. The position of the ingredient in the list, which indicates the quantity. The length of the formula, which reactive skin tolerates better when it is short. And the absence of fragrance, which remains the primary reported cause of reaction.

The percentage displayed on the front matters less than these three points. A 10% formula in a poorly chosen base is less suitable than a 4% formula in a texture adapted to the skin type.

A useful reservation

These ingredients are cosmetic: they act on the appearance and comfort of the skin, without treating any medical condition. Persistent redness requires dermatological advice.